Polarization doping ab initio verification of the concept charge conservation and nonlocality
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2021
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| _version_ | 1866912586545496064 |
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| author | Ahmad, Ashfaq Strak, Pawel Kempisty, Pawel Sakowski, Konrad Piechota, Jacek Kangawa, Yoshihiro Grzegory, Izabella Leszczynski, Michal Zytkiewicz, Zbigniew R. Muziol, Grzegorz Monroy, Eva Krukowski, Stanislaw Kaminska, Agata |
| author_facet | Ahmad, Ashfaq Strak, Pawel Kempisty, Pawel Sakowski, Konrad Piechota, Jacek Kangawa, Yoshihiro Grzegory, Izabella Leszczynski, Michal Zytkiewicz, Zbigniew R. Muziol, Grzegorz Monroy, Eva Krukowski, Stanislaw Kaminska, Agata |
| contents | In this work, we study the emergence of polarization doping in AlxGa1-xN layers with graded composition from a theoretical viewpoint. We demonstrate that the charge conservation law applies for fixed and mobile charges separately, leading to nonlocal compensation phenomena involving bulk fixed and mobile charge and polarization sheet charge at the heterointerfaces. The magnitude of the effect allows obtaining technically viable mobile charge density for optoelectronic devices without impurity doping (donors or acceptors). Therefore, it provides an additional tool for the device designer, with the potential to attain high conductivities: high carrier concentrations can be obtained even in materials with high dopant ionization energies, and the mobility is not limited by scattering at ionized impurities. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2106_01029 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Polarization doping ab initio verification of the concept charge conservation and nonlocality Ahmad, Ashfaq Strak, Pawel Kempisty, Pawel Sakowski, Konrad Piechota, Jacek Kangawa, Yoshihiro Grzegory, Izabella Leszczynski, Michal Zytkiewicz, Zbigniew R. Muziol, Grzegorz Monroy, Eva Krukowski, Stanislaw Kaminska, Agata Materials Science Applied Physics In this work, we study the emergence of polarization doping in AlxGa1-xN layers with graded composition from a theoretical viewpoint. We demonstrate that the charge conservation law applies for fixed and mobile charges separately, leading to nonlocal compensation phenomena involving bulk fixed and mobile charge and polarization sheet charge at the heterointerfaces. The magnitude of the effect allows obtaining technically viable mobile charge density for optoelectronic devices without impurity doping (donors or acceptors). Therefore, it provides an additional tool for the device designer, with the potential to attain high conductivities: high carrier concentrations can be obtained even in materials with high dopant ionization energies, and the mobility is not limited by scattering at ionized impurities. |
| title | Polarization doping ab initio verification of the concept charge conservation and nonlocality |
| topic | Materials Science Applied Physics |
| url | https://arxiv.org/abs/2106.01029 |